987928077321 has 24 divisors (see below), whose sum is σ = 1511450010720. Its totient is φ = 619670825856.

The previous prime is 987928077319. The next prime is 987928077347. The reversal of 987928077321 is 123770829789.

987928077321 is a `hidden beast` number, since 9 + 87 + 92 + 80 + 77 + 321 = 666.

It is not a de Polignac number, because 987928077321 - 2¹ = 987928077319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (987928077421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 607495 + ... + 1531308.

It is an arithmetic number, because the mean of its divisors is an integer number (62977083780).

Almost surely, 2^987928077321 is an apocalyptic number.

It is an amenable number.

987928077321 is a deficient number, since it is larger than the sum of its proper divisors (523521933399).

987928077321 is a wasteful number, since it uses less digits than its factorization.

987928077321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2141845 (or 2141842 counting only the distinct ones).

The product of its (nonzero) digits is 21337344, while the sum is 63.

The spelling of 987928077321 in words is "nine hundred eighty-seven billion, nine hundred twenty-eight million, seventy-seven thousand, three hundred twenty-one".